Be careful not to lose grip on the buzzer and let it hit someone. The buzzer is a bit loud and annoying. [Optional] Put on the earmuffs. Flick the switch soldered to the buzzer so that it emits sound.

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Use this short film as an introduction to a Doppler effect demonstration using a buzzer swung around on a ... This short film will be relevant for teaching physics. This topic appears in OCR ...